fix: Specifying the use of NVD API2 is being ignored

[anthonyharrison]

Description

The following lines in cli.py override the api2 setting of --nvd

    if args["nvd_api_key"]:
        nvd_type = "api"

The change of nvd_type, should only occur in the nvd_type is not "api2"

To reproduce

Specify -n api2 on the command line with other parameters as appropriate

Expected behavior:

This should appear in the log if -n api2 is specified on the command line

       INFO     cve_bin_tool - [Using NVD API 2.0]     

Actual behaviour:

This appears in the log if -n api2 is specified on the command line

       INFO     cve_bin_tool - [Using NVD API]   

Version/platform info

Version of CVE-bin-tool( e.g. output of cve-bin-tool --version): 3.2.2dev0
Installed from pypi or github? github
Operating system: Linux/Windows (other platforms are unsupported but feel free to report issues anyhow) Linux

• On Linux (or Windows Subsystem for Linux) you can run uname -a
• On Windows you can run systeminfo | findstr /B /C:"OS Name" /C:"OS Version"
  Python version (e.g. python3 --version): 3.10
  Running in any particular CI environment we should know about? (e.g. Github Actions) N/A

Anything else?

[torabi12]

I can not update the DB using api2:

[anthonyharrison]

I am getting a 503 - Service Unavailable when I try today.

UPDATE Now appears to be working